Table 2.
Chi-square test results of fitting model, 2015–2018
| 2015 | 2016 | 2017 | 2018 | |
|---|---|---|---|---|
| Degrees of freedom | 3 | 3 | 3 | 3 |
| Accepting value at 5% significant level | 7.815 | 7.815 | 7.815 | 7.815 |
| χ2 | 0.490 | 4.235 | 0.928 | 1.53 |
| P value | > 0.05 | > 0.05 | > 0.05 | > 0.05 |
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